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From: Christoph Hellwig <hch@infradead.org>
Subject: Re: [RFC 0/4] Virtio uses DMA API for all devices
Date: Mon, 6 Aug 2018 09:10:40 -0700
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To: "Michael S. Tsirkin" <mst@redhat.com>
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On Mon, Aug 06, 2018 at 07:06:05PM +0300, Michael S. Tsirkin wrote:
> > I've done something very similar in the thread I posted a few years
> > ago.
> 
> Right so that was before spectre where a virtual call was cheaper :(

Sorry, I meant days, not years.  The whole point of the thread was the
slowdowns due to retpolines, which are the software spectre mitigation.